Compressor



March 24, l

c 'c. SPREEN 1,797,803

COMPRESSOR Filed April 18 1927 EharIQsEE mm Invarfl'nr Patented Mar. 24, 1931 i UNlTED'ST-ATES PATENT OFFICE CHARLES C. SPREEN, OF DETROIT, MICHIGAN comranssoa Application filed April is, 1927. Serial No. 184,593.

My invention relates to mechanical refrigabove, and ports 22 extend from the ports 21 crating systems, andmore particularlyto through the sides of the piston. The sleeve tems of 'the compressor-coiidenser evapora- 18 is provided with a pluralityof ports 23, tor type. and the casing surrounding such ports is An object of my invention is to increase formed to provide a chamber 24 with which the refrigerating capacity of refrigerating connection is made with an evaporator systems by providing a method of compress- Theoutlet coupling 13 is connected with a ing the refrigerant prior to its entrance into condenser 26 which is in circuit with the the compressor. evaporator. The system illustrated is of the A further object of my invention is to proconventional compressor-condenser-evapora- 60 duce a maximum refrigerating capacity in tor type of the dry type, however it could be mechanical refrigerating systems by the proconstructed as the wet or flooded type for vision of mechanism for compressing exthe application of my invention. panded refrigerantprior to its entrance into My invention is associated with the low the main compressor. pressure side of the refrigerating system, and 65 7 Another object of my invention is to prethe suction or return conduit is preferably compress expanded refrigerant prior to enconstructed for such purpose. The return trance into thecompressor of a mechanical conduit comprises a piping 27 leading from refrigerating system by pump mechanism asthe evaporator, a casing 28, an elbow 29 and sociatcd and operating in conjunction with a coupling Pill-intermediate the piping and 70 the compressor. the casing. An end of the elbow is secured Other objects of the invention, more or less to the compressor casing and is in open coniincidental or ancillary to the foregoing will munication with the chamber 24. The casing appear in the following description which 28 is formed to provide a. housing for the sets forth in connection with the accompanycontrifugal pump 31,the rear end of which 75 ing drawings a preferred embodiment of the closes the rear end of the adjacent housing, invention. and the outer side having projecting blades In the accompanying drawings, I have il- 32 which force the expanded refrigerant lustrated a mechanical refrigerating system, from the evaporator into an annular passage partially in section and partially diagram- 33 leading to the elbow 29. so

matically, with which 18 incorporated my in- The pump 18 carried by a shaft 34 which is Vention. mounted in a bearing 35 in the compressor Referring to the drawings in detail, 10 casing. A gear 36 is-secured upon the shaft represents a compressor casing which is 34 and meshes with a gear 37 secured to the B5 secured'upon a base-11, the compressor havend of the crankshaft 14 extending through ing a head 12 provided with an outlet and a the bearing 16. The pump with its sha it will con ling 13 therefor. A crank shaft 14 exbe driven through the gears from the crank tends transversely of the compressor casing, shaft, thus operating simultaneously with being mounted in bearings 15 and 16 through the compressor.

to which they project, and being driven by a Expanded refrigerant from the evaporator suitable source of power. A seal 17 is arwill be drawn through the pipe 27 into the ranged V to prevent leakage of refrigerant casing 28 and will he initially compressed by under pressure exteriorly of the casing the pump 31. The initially compressed rethrough the bearing 15. The upper portion frigerant travels from the pump through the L5 )f the compressor casing is provided with a elbow 29 into the chamber 24 and thence sleeve lining 18 within which a piston 19 is through the ports 23, either directly into the reciprocated by the crank shaft through the compressor chamber or through the piston connecting rod 20. The piston is provided and into the compressor chamber. with inlet ports 21 through whichrefrigerant The pump, initially compressing the expasses into the compression chamber therepanded refrigerant prior to its entrance into the compressor chamber, will increase the amount of refri erant compressed by the compressor, and t us increase the refrigerating capacity of the system. The pump, it will be seen, provides a method of increasing the quantity of refrigerant delive redupon each stroke of the compressor, and therefore the refrigerating capacity ofthe system.

Various changes can be made in the structure herein described without departing from the spirit of the invention and the scope of the claims.

What I claim is:

1. In a mechanical refrigerating system, a two stage refrigerant compressing means comprising a unitary casing having a cylinder. formed therein, a rotary pump within said casing to initially compress the vaporized refrigerant, a reciprocating piston within said cylinder to finally compress the initially compressed refrigerant delivered thereto from said rotary pump, means for driving said piston, and gear means connecting said piston driving means with said rotary pump to provide for driving said piston and said rotary pump from a single source of power.

2. In a mechanical refrigerating system, a two stage refrigerant compressing means comprising a casing having a cylinder formed therein, a rotary pump within said casing adapted to initially compress the vaporized refrigerant, a reciprocating piston within said cylinder to finally compress the initially compressed refrigerant delivered thereto from said pump, means for reciprocating said piston including a crank shaft, and a connectin rod, hearings in said casing to receive said crank shaft, one of said bearings being detachable as a unit, and gear means connecting said pump and saidpiston for operation from a single source of power.

3. In a mechanical refrigerating system, a two stage refrigerant compressing means comprising a casing having a cylinder formed therein, a rotary pump within said casing to initially compress the-vaporized refrigerant, a reciprocating piston within said cylinder to finally compress the initially compressed refrigerant delivered thereto from said pump, means for reciprocating said piston including a crank shaft, and a connectmg .rod, bearings in said casing to receive said crank shaft, one of said bearings being detachable as a unit, resilient sealing means associated with said detachable bearing to form a gastight joint with said crank shaft, and gear means connecting said pump and said piston for operation from a single source of power. I

4. In a mechanical refrigerating system, a two stage refrigerant compressing means comprising a casing having an enlarged side portion forming a refrigerant inlet chamber and an enlarged upper portion forming a cylindrical compression chamber and an annular refrigerant inlet passageway in communication therewith, means connecting the inlet chamber and the inlet passageway, a rotary pump within said inlet chamber to initially compress vaporized refrigerant, a repirocating piston within said cylinder to finally compress the initially compressed refrigerant de livered thereto from said pump, and means for. driving said pump and said piston from a single source of power.

5. In a mechanical refrigerating system, a two-stage refrigerant compressing means comprising a casing having an enlarged side portion forming a refrigerant inlet chamber and an enlarged upper portion forming a cylindrical chamber provided with an annu lar recess adjacent its upper extremity, a sleeve. provided with openings communicating with the said recess disposed in said cylindrical chamber, a rotary pump within the casing for initially compressing the refrigerant in the inlet chamber, a piston within the aforesaid sleeve for finally compressing the initially compressed refrigerant, means communicating with the inlet chamber for delivering the initially compressed refrigerant to the annular recess, and means for driving said pump and said piston from a single source of power.

In testimony whereof I hereunto afiix my signature.

CHARLES C. SPREEN.

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